/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package cn.edu.seu.cose.hobbysharing.servlet;

import cn.edu.seu.cose.hobbysharing.bean.UserList;
import cn.edu.seu.cose.hobbysharing.dao.HobbyDao;
import cn.edu.seu.cose.hobbysharing.tool.XMLTranslator;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author zc
 */
@WebServlet(name = "FriendsIntroducer", urlPatterns = {"/recommend"})
public class FriendsRecommender extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/xml;charset=UTF-8");
        String s = request.getParameter("size");//返回的推荐列表的大小
        String uid = request.getParameter("user_id");
        PrintWriter out = response.getWriter();
        if(uid==null||s==null){
            response.sendError(400);
        }
        int size = Integer.parseInt(s);
        try {
            HobbyDao hd = new HobbyDao();
            out.print(XMLTranslator.objToXML(
                    new UserList().setUser(
                    hd.getUsersWithMostCommonHobbiesWhoIsNotAFriend(uid, size))));
        } catch(Exception e){
            response.sendError(500,e.getMessage());
        }finally {            
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
